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[Bug 1497218] [NEW] nova-api and nova-compute repeated examination “allow_resize_to_same_host”

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Public bug reported:

1. version
kilo 2015.1.0

2. Relevant log files:

2.1 nova-scheduler.log

2015-09-18 12:57:03.981 21782 INFO nova.filters [req-87d25f64-fd40-49cc-
873c-6aad4da3ade9 9c67877ee37b47e989148a776862c7b8
40fc54dc632c4a02b44bf31d7ff15c82 - - -] Filter ComputeFilter returned 0
hosts for instance 02a31655-06da-47f7-a3e4-b3f654789cd2

2.2 nova-compute.log

2015-09-18 13:12:06.517 28500 ERROR nova.compute.manager [req-03981386-9782-49de-8134-aa5437adbbfd 9c67877ee37b47e989148a776862c7b8 40fc54dc632c4a02b44bf31d7ff15c82 - - -] [instance: 02a31655-06da-47f7-a3e4-b3f654789cd2] Setting instance vm_state to ERROR
2015-09-18 13:12:06.517 28500 TRACE nova.compute.manager [instance: 02a31655-06da-47f7-a3e4-b3f654789cd2] Traceback (most recent call last):
2015-09-18 13:12:06.517 28500 TRACE nova.compute.manager [instance: 02a31655-06da-47f7-a3e4-b3f654789cd2]   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 6748, in _error_out_instance_on_exception
2015-09-18 13:12:06.517 28500 TRACE nova.compute.manager [instance: 02a31655-06da-47f7-a3e4-b3f654789cd2]     yield
2015-09-18 13:12:06.517 28500 TRACE nova.compute.manager [instance: 02a31655-06da-47f7-a3e4-b3f654789cd2]   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 4096, in prep_resize
2015-09-18 13:12:06.517 28500 TRACE nova.compute.manager [instance: 02a31655-06da-47f7-a3e4-b3f654789cd2]     filter_properties)
2015-09-18 13:12:06.517 28500 TRACE nova.compute.manager [instance: 02a31655-06da-47f7-a3e4-b3f654789cd2]   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 4085, in prep_resize
2015-09-18 13:12:06.517 28500 TRACE nova.compute.manager [instance: 02a31655-06da-47f7-a3e4-b3f654789cd2]     node, clean_shutdown)
2015-09-18 13:12:06.517 28500 TRACE nova.compute.manager [instance: 02a31655-06da-47f7-a3e4-b3f654789cd2]   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 4033, in _prep_resize
2015-09-18 13:12:06.517 28500 TRACE nova.compute.manager [instance: 02a31655-06da-47f7-a3e4-b3f654789cd2]     raise exception.MigrationError(reason=msg)
2015-09-18 13:12:06.517 28500 TRACE nova.compute.manager [instance: 02a31655-06da-47f7-a3e4-b3f654789cd2] MigrationError: Migration error: destination same as source!
3. Reproduce steps:

3.1 
I have one controller  and  one compute node。
create a VM 
3.2
resize the VM in the following different situations：

----------------------------------------------------------------------------------------------------------------------------------------
ID   |   controller'S nova.conf                |  compute node'S nova.conf         |  resize'result  | log    |
----------------------------------------------------------------------------------------------------------------------------------------
1    |  allow_resize_to_same_host=True  |  allow_resize_to_same_host=True |     success    |          |
----------------------------------------------------------------------------------------------------------------------------------------
2    |  allow_resize_to_same_host=false  |  allow_resize_to_same_host=True |      failed      |  2.1   |
-----------------------------------------------------------------------------------------------------------------------------------------
3    |  allow_resize_to_same_host=True  |  allow_resize_to_same_host=false |      failed     |  2.2    |
-----------------------------------------------------------------------------------------------------------------------------------------

3.3 
in the codes， has repeated examination “allow_resize_to_same_host” in nova/compute/api.py and nova/compute/manager.py
nova/compute/api.py has follow codes：

if not CONF.allow_resize_to_same_host:
            filter_properties['ignore_hosts'].append(instance.host)

			
nova/compute/manager.py has follow codes：			
elif same_host and not CONF.allow_resize_to_same_host:
            self._set_instance_obj_error_state(context, instance)
            msg = _('destination same as source!')
            raise exception.MigrationError(reason=msg)
			
4 conclusion
modify “allow_resize_to_same_host” in nova.conf on controller need restart nova-api service
modify “allow_resize_to_same_host” in nova.conf on compute node need restart nova-scheduler service
you need modify multiple configs and restart multiple services on different host if you want resize a vm on same host
I think this way is very inconvenient and unnecessary

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1497218

Title:
  nova-api  and nova-compute  repeated examination
  “allow_resize_to_same_host”

Status in OpenStack Compute (nova):
  New

Bug description:
  1. version
  kilo 2015.1.0

  2. Relevant log files:

  2.1 nova-scheduler.log

  2015-09-18 12:57:03.981 21782 INFO nova.filters [req-87d25f64-fd40
  -49cc-873c-6aad4da3ade9 9c67877ee37b47e989148a776862c7b8
  40fc54dc632c4a02b44bf31d7ff15c82 - - -] Filter ComputeFilter returned
  0 hosts for instance 02a31655-06da-47f7-a3e4-b3f654789cd2

  2.2 nova-compute.log

  2015-09-18 13:12:06.517 28500 ERROR nova.compute.manager [req-03981386-9782-49de-8134-aa5437adbbfd 9c67877ee37b47e989148a776862c7b8 40fc54dc632c4a02b44bf31d7ff15c82 - - -] [instance: 02a31655-06da-47f7-a3e4-b3f654789cd2] Setting instance vm_state to ERROR
  2015-09-18 13:12:06.517 28500 TRACE nova.compute.manager [instance: 02a31655-06da-47f7-a3e4-b3f654789cd2] Traceback (most recent call last):
  2015-09-18 13:12:06.517 28500 TRACE nova.compute.manager [instance: 02a31655-06da-47f7-a3e4-b3f654789cd2]   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 6748, in _error_out_instance_on_exception
  2015-09-18 13:12:06.517 28500 TRACE nova.compute.manager [instance: 02a31655-06da-47f7-a3e4-b3f654789cd2]     yield
  2015-09-18 13:12:06.517 28500 TRACE nova.compute.manager [instance: 02a31655-06da-47f7-a3e4-b3f654789cd2]   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 4096, in prep_resize
  2015-09-18 13:12:06.517 28500 TRACE nova.compute.manager [instance: 02a31655-06da-47f7-a3e4-b3f654789cd2]     filter_properties)
  2015-09-18 13:12:06.517 28500 TRACE nova.compute.manager [instance: 02a31655-06da-47f7-a3e4-b3f654789cd2]   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 4085, in prep_resize
  2015-09-18 13:12:06.517 28500 TRACE nova.compute.manager [instance: 02a31655-06da-47f7-a3e4-b3f654789cd2]     node, clean_shutdown)
  2015-09-18 13:12:06.517 28500 TRACE nova.compute.manager [instance: 02a31655-06da-47f7-a3e4-b3f654789cd2]   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 4033, in _prep_resize
  2015-09-18 13:12:06.517 28500 TRACE nova.compute.manager [instance: 02a31655-06da-47f7-a3e4-b3f654789cd2]     raise exception.MigrationError(reason=msg)
  2015-09-18 13:12:06.517 28500 TRACE nova.compute.manager [instance: 02a31655-06da-47f7-a3e4-b3f654789cd2] MigrationError: Migration error: destination same as source!
  3. Reproduce steps:

  3.1 
  I have one controller  and  one compute node。
  create a VM 
  3.2
  resize the VM in the following different situations：

  ----------------------------------------------------------------------------------------------------------------------------------------
  ID   |   controller'S nova.conf                |  compute node'S nova.conf         |  resize'result  | log    |
  ----------------------------------------------------------------------------------------------------------------------------------------
  1    |  allow_resize_to_same_host=True  |  allow_resize_to_same_host=True |     success    |          |
  ----------------------------------------------------------------------------------------------------------------------------------------
  2    |  allow_resize_to_same_host=false  |  allow_resize_to_same_host=True |      failed      |  2.1   |
  -----------------------------------------------------------------------------------------------------------------------------------------
  3    |  allow_resize_to_same_host=True  |  allow_resize_to_same_host=false |      failed     |  2.2    |
  -----------------------------------------------------------------------------------------------------------------------------------------

  3.3 
  in the codes， has repeated examination “allow_resize_to_same_host” in nova/compute/api.py and nova/compute/manager.py
  nova/compute/api.py has follow codes：

  if not CONF.allow_resize_to_same_host:
              filter_properties['ignore_hosts'].append(instance.host)

  			
  nova/compute/manager.py has follow codes：			
  elif same_host and not CONF.allow_resize_to_same_host:
              self._set_instance_obj_error_state(context, instance)
              msg = _('destination same as source!')
              raise exception.MigrationError(reason=msg)
  			
  4 conclusion
  modify “allow_resize_to_same_host” in nova.conf on controller need restart nova-api service
  modify “allow_resize_to_same_host” in nova.conf on compute node need restart nova-scheduler service
  you need modify multiple configs and restart multiple services on different host if you want resize a vm on same host
  I think this way is very inconvenient and unnecessary

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